Jack



W. B. RUNYAN May 9, 1933.

JACK

Filed July 14, 1950 Patented May 9, 1933 WILLIAM B. RUNYAN, OF DAYTON, OHIO,

ASSIGNOR TO THE DAYTON MALLEABLE IRON COMPANY, OF DAYTON, OHIO, A CORPORATION OF OHIO JACK Application led July 14,

This invention relates to lifting jacks.

One object of the invention is the pro vision of a lifting jack having means of simple and cheap construction and devoid of springs for controlling the rotational and axial movements of a threaded lifting member.

Another object of the invention is the provision of a double screw jack in which the outer threaded lifting member is provided with a slidable pin extending all the way through the lifting member and adapted to cooperate with ribs arranged in angular spaced relationship in the standard, to control the movements of the lifting screw.

Other objects and advantages of the invention will be apparent from the following description, the accompanying drawing and the appended claims.

In the drawing- Fig. 1 is a vertical section through a lifting ack embodying the present invention;

Fig. 2 is a vertical section through the jack standard on the line 2-2 of Fig. 1;

Fig. 3 is a horizontal section through the jack taken on the line 3-*3 of Fig. 1;

Fig. 4 is a section on the line 4 4 of Fig. 1; and

Fig. 5 is a section on the line 5-5 of Fig. 1.

As illustrating a preferred embodiment, the invention is shown as incorporated in a double screw ack especially adapted for use with balloon tires which require extra lift, but, of course, the invention may be incorporated in other adaptations thereof.

As shown in the drawing, the jack comprises a hollow standard 10, having a base 11. The standard is preferably a metal casting of integral construction, the main body portion 12 of which is connected to the top portion 13 by an integral connecting yoke portion 14.

Loosely mounted within the standard is a hollow threaded lifting screw 16, the externally threaded portion of which is of such diameter that it may freely pass through the circular bores 16 and 17 of the standard and through the hollow passage 18 in the body portion ofthe jack. A threaded engagement with the external screw threads 19 on this 1930. Serial No. 467,662.

lifting screw is a rotatable operating collar or nut 20, this collar being held against upward endwise movement by the upper portion 13 of the standard. The lower side of this collar bears against a suitable antifriction bearing or similar thrust member 21 which rests on top of the lower body portion 12 of the standard. Rotational movements of the collar 2O may be edected by an actuating member 23 which is rotatably mounted in the yoke 14, the inner end of this actuating member having suitable gear teeth 24 or the like engaging corresponding teeth 25 on the collar. As shown the actuating member 23 embodies a bearing part 26 having a hexagonal grip portion 27 socketed at 28 to receive the end of an operating tool, not shown. This bearing portion 23 is attached to the actuating gear by means of a cross pin 29 or the like, the gear and the grip 27 cooperating to prevent axial movements of the actuating member.

The lifting screw 16 is internally threaded at 30 so it telescopically receives the externally threaded inner lifting member 31. This inner member, like the outer lifting screw 16, is of about the same height as the total overall height of the standard so that when the various parts of the jack are extended, the lift exceeds the height of the standard. On the upper end of the inner lifting member 31 there is a saddle 32, connected in place by a through pin 33 or any other suitable means. This saddle is adapted to receive a load such as the axle of an automobile.

Novel means of very simple construction are provided whereby extension of the lifting members is obtained when the collar is rotated. This means embodies a pin 35 slidingly received for endwise movement diametrically of and at the lower end of the outer screw 16. I This pin, which has a length somewhat exceeding the outside diameter of the lifting screw 16, cooperates with guide ribs within the standard so that during raising movements of the load, the outer lifting screw is positively held against rotational movements and caused to move axially up out of the standard until it reaches its upper limit of movement, after which it is perhe rib pos- .tions Qui @d sui'- he htmg l 39 are ne inch 7 UPF/Ofi 516.". shed from 011e. Side when fft "Q Ovt e countecloc nar h m the du? *101; a

umbly who? no 133050.16. t

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men of the screw 16 W movement. hm-@0f 1s prevented bw ace' per-

move# L.e upper end ug towards tha and @nu 'ivf xer i.' LS otgztlozml a i 1D Ween these noi itfmay cam the pin away .from it. if the pin isengaged therewith; vlit will-be obvious that as `vthere is no rrib diametrically. opposite therib. 39 this cammiug action ymay take place, ther-other. end.i of the pin being forced out toward the opposite portion ofthe passage 18. Suppose the screw` 16 `is near its lower limiting position so that the p in 35projectszout just ibelow `the bottom of the rib 39: If the load is engaged, andlis to be lifted, it is quite possible that the sere/w16 might not rotate when the :gearslv areoperated, due.V to .binding of l:the parte orfor'othen reasons. The :projectingflendiofftheipin-,would thus tendto travel vertically and jam against the=bottom of the ri'bf393b1it theg inclined end portion 49 of the rib 39 would prevent this and cause the pin to be cammed diametrically of the screw, so that it would be in position to engage the stop surfaces on the rib 37. The lower end of the rib 38 is provided with an inclined end portion 51, the two ribs being symmetrically formed, and the upper ends of the two ribs 38 and 39 are also provided with inclined end portions 52 and 53 respectively the upper ends of which merge with the cylindrical surface of the hollow passage 18 in the standard. It will be apparent that the inclined end portions 52 and 53 of these two ribs prevent any jamming tendencies of the pin, during lowering movements of the jack should the end of the pin come opposite one of these ribs during .axial movements of the screw while lowering the load.

The lower limiting position of the outer screw 16 is determined by a stop spring wire which is received in one of the threads at the upper end of this screw so that it may engage with the upper side of the collar 20 Iwhen the outer screw 16 is fully retracted within the standard, in which position the pin 35 is somewhat above the lower end of the standard and on the level of the cam side 41 of the rib 37. A stud 46 fixed in one of the threaded grooves at the lower end of the inner lifting member 31. limits the upward movement of this member with respect to its carrying screw 16, and the pin 35 itself limits the upward movement of the screw 16 with i. respect to the standard when it engages the iiange at the lower end of the bore 17. The two screws are assembled into the standard through an opening 47 in the lower end thereof, one side of the opening being extended i at 48 so that the pin 35 may be received when the screws are inserted up through the lower end of the standard. This opening 47 may he closed by removable plate, not shown, after the screws have been assembled in the jack Y standard.

While the form of apparatus herein described constitutes a preferred embodiment of the invention, it is to be understood that the invention is not limited to this precise form of apparatus, and that changes may be made therein without departing from the scope 'of the invention which is defined in the appended claims.

'lVhat is claimed is: f

1 A lifting jack comprising a standard, a

lifting screwv rotatable in the standard, operating means threaded on said screw, a pin slidaole diametrically in said screw and of a length exceeding the outside diameter of the screw, and guide means on the standard cooperating with said pin and effective during various conditions of use between the upperfand lower limiting positions ofthe screw forpreventing rotational movements' of said screw while: permitting axial movements thereof, said guide means having inclined end portions to prevent the pin from jamming against the'ends of thei guidemeans at a limiting position of Vthe screw. 2. lifting yjack comprising a standard, alifting screw rota-table in the standard, operating means threaded on said screw for causing rotational and axial movements thereof, ribs within said standard, a pin slidably mounted in the lower end of said screw and having a length exceeding the outside diameter of said screw by an amount approximately equal to the depth of said ribs, said ribs having end portions for camming saidl pin diametrically of said screw.

3. A liftingy jack comprisinga standard, alifvting, screw rotatable in the standard, operating vmeans threadedvon said screw for causing rotational and axial movements thereof, a plurality of ribs within said standard none of which are diametrically .opposite one another, a pin slidably mounted in. thelower end of said screw and :having a length exceeding the outside diameteriof said screw by an amount approximately equal to the depth `of ,said ribs, said ribshaving end portions for camming said pin diametricallyof said screw. l. a

4E.v A..li`fting jack comprising a. standard, a

lifting screw rotatable in the standard, an operating device threadedon said screw, means for rotating said device, a pin slid` ably .mounted for endwise movement diametrically of the lower end, of said screw, ribs within said standard of substantially similar vertical extent .having pin" stopping surfaces, one of said ribs havinga4 gradually curved side to c-am the pin away from said rib, the length of the pin exceeding the diameter of thelifting screw. v e

5. A lifting jack comprising a Standard, a-lifting screw rotatable in the standard, an operating device threaded on said screw, means for rotating said device, a pin slidably mounted for endwise movement diametrically of the lower end of said screw, a plurality of ribs within said standard adapted to cooperate with said pin during various conditions of use between the upper and lower limitingV positions Yof the screw,fone'ofjsaid 1 rib?, having pin stopping s nrfacas along* both @nies thereof nn another oneV of said ribs having on@ topping surface aiong one Side thereo' vile tha other Sife is gradually Curd tin* its'mitireyingth to c ani tifiefpin' n-w I rib', the ien-'f5 Off-the pnfrexreilding "nini-Stm of' the lifting screw.

i (i. It iii'tingjjaci Por' extormii' tbreafis 'i in *ghe s inni, an @panting coiinr'threaded en' sind irng $rrew,` n'ijeans for operating s idnilrgf nd L ving' me'nibsr thread-- e'dwvi'thin Snijd 'ingscrewg i' Siidbie pin rely' 'supporti-jd' for "endwis vIn()'ve'n'rt' zicf'rgs's hallan-@fiend of 'the lifting screw and hziviigrzilngth exceeding' 'the'dianieter `o' the Shrew; and? ai 'plurality nfribs ei'iive during YarionsCC/onditinsof use btwen Ithe nlp'per-andfimver lii'nit'3 '\'p,oSitions of ,itfhe Srwfr'Ggixgnniin" nvriid V1 in and extending up `n the' Stan rd 'nd 'locatednngular distances apart S0' that' nne of 'the ribsA 'are y* dizznietrici-l'y'Qpposed; Y K 25 A Y 0 comprising si Standard, a

tnrezifd iii-tn ^f scrgaw rntntzibife in tine Standn-rQ, @s/omni l'rting4 rninber rotated in said lifting screw, 'n I'Qtfitibig collar threndedfon Saidr'liting Straw; niens'Qr npe'rating said n integrl'stnp niniber @intendiy Oi the Iii lscrew atthe "1 thereof, and plurality of upward# 15;); ribsr Within saidlstandnrmone Sing fi Standard. sin ring ,screw rotatable.

nfiy atthebtii innitoftmvel, another of sind ribsfhving -a length substantially shorter than ting total axizittliflgffth screvfsb fs b; 'ineffective Lit' the upper and,

Sellem-imam fm @pei-ating Y 'dflifting 'Screw' 4ai siidiibvle {pinV giy' si pprted for endiviso rnvement 'tii'eimiier enfti'of ti'ieviifting screw, and' t LLI;infinnRUNYAN.` 

